Dell Force10 S55T FTOS Command Line Reference Guide for the S55 System FTOS 8. - Page 802
spanning-tree pvst err-disable, tc-flush-standard
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www.dell.com | support.dell.com Related Commands show spanning-tree pvst View PVST+ configuration spanning-tree pvst err-disable c e s Place ports in an err-disabled state if they receive a PVST+ BPDU when they are members an untagged VLAN. Syntax spanning-tree pvst err-disable cause invalid-pvst-bpdu Defaults Enabled; ports are placed in err-disabled state if they receive a PVST+ BPDU when they are members of an untagged VLAN. Command Modes INTERFACE Command History Version 8.3.5.0 Version 8.2.1.0 Introduced on S55 Introduced Usage Some non-Dell Force10 systems which have hybrid ports participating in PVST+ transmit two kinds of Information BPDUs: an 802.1D BPDU and an untagged PVST+ BPDU. Dell Force10 systems do not expect PVST+ BPDU on an untagged port. If this happens, FTOS places the port in error-disable state. This behavior might result in the network not converging. To prevent FTOS from executing this action, use the command no spanning-tree pvst err-disable cause invalid-pvst-bpdu. Related Commands show spanning-tree pvst View the PVST+ configuration. tc-flush-standard c e s Enable the MAC address flushing upon receiving every topology change notification. Syntax tc-flush-standard To disable, use the no tc-flush-standard command. Defaults Disabled Command Modes CONFIGURATION Command History Version 8.3.5.0 Version 7.6.1.0 Version 7.5.1.0 Version 6.5.1.0 Introduced on S55 Support added for S-Series Support added for C-Series Introduced Usage Information By default FTOS implements an optimized flush mechanism for PVST+. This helps in flushing the MAC addresses only when necessary (and less often) allowing for faster convergence during topology changes. However, if a standards-based flush mechanism is needed, this knob command can be turned on to enable flushing MAC addresses upon receiving every topology change notification. 802 | Per-VLAN Spanning Tree plus (PVST+)